| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.onosproject.bgpio.types; |
| |
| import java.net.InetAddress; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.onlab.packet.Ip4Address; |
| import org.onosproject.bgpio.exceptions.BGPParseException; |
| import org.onosproject.bgpio.protocol.BGPLSNlri; |
| import org.onosproject.bgpio.protocol.linkstate.BGPPrefixIPv4LSNlriVer4; |
| import org.onosproject.bgpio.protocol.linkstate.BGPNodeLSNlriVer4; |
| import org.onosproject.bgpio.protocol.linkstate.BgpLinkLsNlriVer4; |
| import org.onosproject.bgpio.util.Constants; |
| import org.onosproject.bgpio.util.Validation; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.MoreObjects; |
| |
| /* |
| * Provides Implementation of MpReach Nlri BGP Path Attribute. |
| */ |
| public class MpReachNlri implements BGPValueType { |
| |
| private static final Logger log = LoggerFactory.getLogger(MpReachNlri.class); |
| public static final byte MPREACHNLRI_TYPE = 14; |
| public static final byte LINK_NLRITYPE = 2; |
| |
| private boolean isMpReachNlri = false; |
| private final List<BGPLSNlri> mpReachNlri; |
| private final int length; |
| private final short afi; |
| private final byte safi; |
| private final Ip4Address ipNextHop; |
| |
| /** |
| * Constructor to initialize parameters. |
| * |
| * @param mpReachNlri MpReach Nlri attribute |
| * @param afi address family identifier |
| * @param safi subsequent address family identifier |
| * @param ipNextHop nexthop IpAddress |
| * @param length of MpReachNlri |
| */ |
| public MpReachNlri(List<BGPLSNlri> mpReachNlri, short afi, byte safi, Ip4Address ipNextHop, int length) { |
| this.mpReachNlri = mpReachNlri; |
| this.isMpReachNlri = true; |
| this.ipNextHop = ipNextHop; |
| this.afi = afi; |
| this.safi = safi; |
| this.length = length; |
| } |
| |
| /** |
| * Returns whether MpReachNlri is present. |
| * |
| * @return whether MpReachNlri is present |
| */ |
| public boolean isMpReachNlriSet() { |
| return this.isMpReachNlri; |
| } |
| |
| /** |
| * Returns list of MpReach Nlri. |
| * |
| * @return list of MpReach Nlri |
| */ |
| public List<BGPLSNlri> mpReachNlri() { |
| return this.mpReachNlri; |
| } |
| |
| /** |
| * Returns length of MpReachNlri. |
| * |
| * @return length of MpReachNlri |
| */ |
| public int mpReachNlriLen() { |
| return this.length; |
| } |
| |
| /** |
| * Reads from ChannelBuffer and parses MpReachNlri. |
| * |
| * @param cb channelBuffer |
| * @return object of MpReachNlri |
| * @throws BGPParseException while parsing MpReachNlri |
| */ |
| public static MpReachNlri read(ChannelBuffer cb) throws BGPParseException { |
| ChannelBuffer tempBuf = cb.copy(); |
| Validation parseFlags = Validation.parseAttributeHeader(cb); |
| int len = parseFlags.isShort() ? parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_SHORT : |
| parseFlags.getLength() + Constants.TYPE_AND_LEN_AS_BYTE; |
| ChannelBuffer data = tempBuf.readBytes(len); |
| |
| if (cb.readableBytes() < parseFlags.getLength()) { |
| Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_LENGTH_ERROR, |
| parseFlags.getLength()); |
| } |
| if (!parseFlags.getFirstBit() && parseFlags.getSecondBit() && parseFlags.getThirdBit()) { |
| throw new BGPParseException(BGPErrorType.UPDATE_MESSAGE_ERROR, BGPErrorType.ATTRIBUTE_FLAGS_ERROR, data); |
| } |
| |
| BGPLSNlri bgpLSNlri = null; |
| List<BGPLSNlri> mpReachNlri = new LinkedList<>(); |
| ChannelBuffer tempCb = cb.readBytes(parseFlags.getLength()); |
| short afi = 0; |
| byte safi = 0; |
| Ip4Address ipNextHop = null; |
| while (tempCb.readableBytes() > 0) { |
| afi = tempCb.readShort(); |
| safi = tempCb.readByte(); |
| |
| //Supporting for AFI 16388 / SAFI 71 and VPN AFI 16388 / SAFI 128 |
| if ((afi == Constants.AFI_VALUE) && (safi == Constants.SAFI_VALUE) || (afi == Constants.AFI_VALUE) |
| && (safi == Constants.VPN_SAFI_VALUE)) { |
| byte nextHopLen = tempCb.readByte(); |
| InetAddress ipAddress = Validation.toInetAddress(nextHopLen, cb); |
| if (ipAddress.isMulticastAddress()) { |
| throw new BGPParseException("Multicast not supported"); |
| } |
| ipNextHop = Ip4Address.valueOf(ipAddress); |
| byte reserved = tempCb.readByte(); |
| |
| while (tempCb.readableBytes() > 0) { |
| short nlriType = tempCb.readShort(); |
| short totNlriLen = tempCb.readShort(); |
| if (tempCb.readableBytes() < totNlriLen) { |
| Validation.validateLen(BGPErrorType.UPDATE_MESSAGE_ERROR, |
| BGPErrorType.ATTRIBUTE_LENGTH_ERROR, totNlriLen); |
| } |
| tempBuf = tempCb.readBytes(totNlriLen); |
| switch (nlriType) { |
| case BGPNodeLSNlriVer4.NODE_NLRITYPE: |
| bgpLSNlri = BGPNodeLSNlriVer4.read(tempBuf, afi, safi); |
| break; |
| case BgpLinkLsNlriVer4.LINK_NLRITYPE: |
| bgpLSNlri = BgpLinkLsNlriVer4.read(tempBuf, afi, safi); |
| break; |
| case BGPPrefixIPv4LSNlriVer4.PREFIX_IPV4_NLRITYPE: |
| bgpLSNlri = BGPPrefixIPv4LSNlriVer4.read(tempBuf, afi, safi); |
| break; |
| default: |
| log.debug("nlriType not supported" + nlriType); |
| } |
| mpReachNlri.add(bgpLSNlri); |
| } |
| } else { |
| throw new BGPParseException("Not Supporting afi " + afi + "safi " + safi); |
| } |
| } |
| return new MpReachNlri(mpReachNlri, afi, safi, ipNextHop, parseFlags.getLength()); |
| } |
| |
| @Override |
| public short getType() { |
| return MPREACHNLRI_TYPE; |
| } |
| |
| /** |
| * Returns AFI. |
| * |
| * @return AFI |
| */ |
| public short afi() { |
| return this.afi; |
| } |
| |
| /** |
| * Returns Nexthop IpAddress. |
| * |
| * @return Nexthop IpAddress |
| */ |
| public Ip4Address nexthop4() { |
| return this.ipNextHop; |
| } |
| |
| /** |
| * Returns SAFI. |
| * |
| * @return SAFI |
| */ |
| public byte safi() { |
| return this.safi; |
| } |
| |
| @Override |
| public int write(ChannelBuffer cb) { |
| //Not to be Implemented as of now |
| return 0; |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("mpReachNlri", mpReachNlri) |
| .add("afi", afi) |
| .add("safi", safi) |
| .add("ipNextHop", ipNextHop) |
| .add("length", length) |
| .toString(); |
| } |
| } |